A diagnostic assay has been developed to detect human cytomegalovirus (HCMV)DNA in clinical specimens with biotin-labelled DNA probe, cloned fragment of HCMV strain ADl69.The biotin-labelled probe can detect 100 pg of homologous DNA and does not hybridize with DNA from other herpesvirus or human embryonic lung cells(HEL) and Hep-2 cells. 30 umbilical cord blood and 10 urine specimens from pregnant women were examined by hybridization assay with biotin-labelled probe. Among 30 umbilical cord blood specimens,...